Fast way to delete files in linux (快速删除大量文件的方式）

result: (conclusion: using find is the safe way, perl is the fastest, rsync is not a bad choice )

COMMAND TIME TAKEN
RM Command Is not capable of deleting large number of files
Find Command with -exec 14 Minutes for half a million files
Find Command with -delete 5 Minutes for half a million files
Perl 1 Minute for half a million files
RSYNC with -delete 2 Minute 56 seconds for half a million files